Regardless of what form symptoms take (SKIN RASH, tingling around the MOUTH, DIARRHEA), a type I hypersensitivity reaction is a systemic response-it affects and involves the body as a whole.
How to Read Your Eyeglass Prescription. The first step to understanding your eyeglass prescription is knowing what OD and OS mean. They are abbreviations for oculus dexter and oculus sinister, which are Latin terms for right eye and left eye.
OD (Oculus Dextrus) means right eye. OS (Oculus Sinister) means left eye. For those patients who have no astigmatism (spherical eyes) and do not require a multifocal or prism, there will be one number for each eye. This number is known as the sphere portion of the prescription. The farther away from zero this number is, the worse your eyesight is.